{"product_id":"t-mobile-vivacity-replacement-battery-37v-1100mah-li-ion","title":"T-Mobile Vivacity Li3712T42P3h475248 Compatible Battery 3.7V 1100mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eT-Mobile Vivacity — 3.7V Li-ion Replacement Battery (Li3712T42P3h475248)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1100mAh Li-ion replacement battery for the T-Mobile Vivacity smartphone. It matches the original cell's voltage and form factor, fitting directly into the Vivacity's battery bay. Dimensions are 51.00 × 46.00 × 5.00mm — confirm against your existing cell before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVivacity platform fit:\u003c\/strong\u003e\n    The Vivacity uses a single-cell 3.7V nominal Li-ion pack with a three-contact connector carrying positive, negative, and a thermistor line. This replacement carries the same contact layout and BMS logic, so the phone's charge IC recognises it without renegotiation.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge on a bench rig monitoring BMS handshake and charge IC response. The protection circuit triggered correctly at both the over-voltage and under-voltage thresholds, and the charge IC accepted the cell without fault codes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After fitting this cell, disable any power-saving fast-charge mode and run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the Vivacity's fuel gauge IC one clean cycle to map the new cell's discharge curve before it begins tracking percentage accurately.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Vivacity reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Vivacity's fuel gauge IC stores a discharge curve calibrated to the original cell over months of use. When a new cell goes in, that stored curve no longer matches the actual voltage-versus-capacity relationship of the fresh chemistry. The IC reads voltage and maps it to the old curve, so it can report 40% when the cell is actually at 65% — or vice versa. One full discharge-to-shutdown followed by an uninterrupted charge to 4.2V resets the reference points the IC uses for future readings.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the cell voltage drops sharply under the load of the screen backlight or cellular radio — a voltage cliff the fuel gauge IC did not predict. The phone's low-voltage protection fires and cuts power even though the percentage readout still showed reserve. It is more pronounced on a new cell before the fuel gauge IC has completed a calibration cycle. Run one full discharge without interruption; the IC will shift its shutdown threshold to match the actual voltage cliff of this cell, and premature cutoffs will stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405045399642,"sku":"BWCS-ZTP736SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405045432410,"sku":"BWCS-ZTP736SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405045465178,"sku":"BWCS-ZTP736SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTP736SL-1.webp?v=1779369898","url":"https:\/\/batteryweb.com\/products\/t-mobile-vivacity-replacement-battery-37v-1100mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}